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Well, my 8inch is f6 and I do notice a bit of coma. Especially as magnification increases. But then I may be getting a little too critical. I have a 400d, which I tend to only use for my attempts at deep sky stuff. It is this one, not the dmk and the planetary imaging, that has made me look at the coma issue. Anyway my next purchase will be an MPCC. From what I have read, I think it will be worth it.
Darrell
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